Have you been diagnosed with low vitamin D?

I remember watching an episode of wife swap where one of the wives seemed a bit off her rocker and believed that the sun provided her with sustenance, so she would spend time outside each day being fed by the sun. Anyways, I wish I took a note from her because I have just learned I have low vitamin D and will have to take a prescription to replace it.

If you were found to have low D what was your course of action and what effects did it have on you? Do you now sunbathe?